21299798 has 16 divisors (see below), whose sum is σ = 36219120. Its totient is φ = 9313056.

The previous prime is 21299791. The next prime is 21299807. The reversal of 21299798 is 89799212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21299791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21065 + ... + 22052.

It is an arithmetic number, because the mean of its divisors is an integer number (2263695).

Almost surely, 2^21299798 is an apocalyptic number.

21299798 is a deficient number, since it is larger than the sum of its proper divisors (14919322).

21299798 is a wasteful number, since it uses less digits than its factorization.

21299798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43151.

The product of its digits is 163296, while the sum is 47.

The square root of 21299798 is about 4615.1704193886. The cubic root of 21299798 is about 277.1991078905.

The spelling of 21299798 in words is "twenty-one million, two hundred ninety-nine thousand, seven hundred ninety-eight".